题目内容
句型转换：
It took the firemen half an hour to put out the fire．(划线部分提问)
________ ________ ________ it ________ the firemen to put out the fire．
答案：How,long,did,take
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题目内容
句型转换：
It took the firemen half an hour to put out the fire．(划线部分提问)
________ ________ ________ it ________ the firemen to put out the fire．